/Engine/Source/Runtime/AnimationCore/Public/BoneWeights.h
Sets the maximum number of weights that can be applied to a singleFBoneWeightsobject. When weights are added, the smallest weights, past this limit, are dropped.
[FBoneWeightsSettings](API\Runtime\AnimationCore\FBoneWeightsSettings) & SetMaxWeightCount ( int32 InMaxWeightCount )